I'm using a cheap CZR pipe for the winter so it can take the beating from the salt instead of the stocker.
Really too loud for my tastes but, it's not like I'm off-roading the thing in the winter (more commuting). F.W.I.W. Since I had already rejetted for the air-box mod she really came alive all over the rev-range. What's really funny is that even after re-gearing 4 teeth bigger on the rear, my mileage has stayed the same with an avg. of 54mpg.
This spring I'll be looking into the 2-bros pipe with the added noise restrictor. (I've really grown to like the big singles sound...just not quite this loud)